Re: arc or curve fitting program

--- In CAD_CAM_EDM_DRO@y..., "karl_l_townsend" <karl@c...> wrote:

> I'm taking some careful measurements on a part I'm reverse
> engineering.
>
> Given three, or more, points on a curve. How do I calculate the

best

> G02/G03 parameters to cut that curve? I'm hoping for a simple

windows

> app. that lets you put in points and gives the center and radius of
> the circle fitting those points the best. Also, I'll need to be

able

> to calculate x,y points on that curve (you need endpoints in G02

and

> I'll not be able to measure right at the endpoint). Is the formula
> r**2 = (y - a)**2 + (x - b)**2 ?
>
> I remember covering this in calculus class 30 years ago, but the

only

> reason I got through calculus was due to a very smart girl that let
> me sit right next to her, very near her paper, during quizes.
> Fortunately my eyes had great distance vision at that time <G>
>
>
> Karl

Dear Karl:
I have a BASIC program which I wrote earlier which does what you want.
It is accurate to about .001" and needs BASIC to run it. You list
the X1, Y1 and X2, Y2, and X3, Y3 points, and it gives you the G Code
for these points.
Jack C.